Could this be meteorite impact glass or industrial slag. My first thought was slag but then the rock underneath. One sticks to magnet the other with

[Shinyrock]

 

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[vpnavy]

Until a member pipes in - here are a few informative articles talking about meteorites...

University of New Mexico - Institute of Meteoritics Meteorite Curation and Museum
Meteorites are pieces of asteroids and other bodies like the moon
and Mars that travel through space and fall to the earth...


Do You Think You May Have Found a Meteorite?
Portland State University - Meteorite identification
The mission of our laboratory is to conduct meteorite research to help understand our place in the universe...



About Meteorites
Aerolite Meteorites
A meteorite is a piece of iron, stone, or stony-iron composite that has fallen to Earth from outer space...


How to find out if you have a Meteorite?
Meteorite-Identification.Com
The purpose of this site is to help the visitor better understand elementary identification
of the most common meteorites...

Suspect Meteorite Tests​